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[SV 63098] Temporarily revert the change to pattern rule behavior
The fix for SV 12078 caused a backward-compatibility issue with some makefiles. In order to allow users to resolve this issue, revert that change for this release cycle: it will be reinstated in the next release cycle. Introduce a warning if we detect that the recipe of a multi-target pattern rule doesn't create all the targets. * NEWS: Announce the future backward-incompatibility. * doc/make.texi (Pattern Intro): Describe the behavior and that it will change in the future. * src/remake.c (check_also_make): Check for also_make targets that were not created and generate a warning. (update_goal_chain): Call the new function. (check_dep): Ditto. (update_file_1): Defer implicit rule detection until after we check all the also_make files (as it used to be). * tests/scripts/features/patternrules: Add tests of the new warning. Skip the tests for SV 12078.
This commit is contained in:
Paul Smith
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22
NEWS
22
NEWS
@ -22,6 +22,16 @@ https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=109&se
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In the NEXT release of GNU make, support for these systems will be removed.
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If you want to see them continue to be supported, contact <bug-make@gnu.org>.
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* WARNING: Future backward-incompatibility!
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In the NEXT release of GNU make, pattern rules will implement the same
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behavior change for multiple targets as explicit grouped targets, below: if
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any target of the rule is needed by the build, the recipe will be invoked if
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any target of the rule is missing or out of date. During testing some
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makefiles were found to contain pattern rules that do not build all targets;
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this can cause issues so we are delaying this change for one release cycle
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to allow these makefiles to be updated. GNU make show a warning if it
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detects this situation: "pattern recipe did not update peer target".
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* WARNING: Backward-incompatibility!
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GNU make now uses temporary files in more situations than previous releases.
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If your build system sets TMPDIR (or TMP or TEMP on Windows) and deletes the
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@ -32,12 +42,12 @@ https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=109&se
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needs to find its temporary directory before the makefiles are parsed.
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* WARNING: Backward-incompatibility!
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Previously each target in a grouped target rule (pattern or explicit) was
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considered individually: if the targets needed by the build were not out of
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date the recipe was not run even if other targets in the group were out of
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date. Now if any of the grouped targets are needed by the build, then if
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any of the grouped targets are out of date the recipe is run and all targets
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in the group are considered updated.
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Previously each target in a explicit grouped target rule was considered
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individually: if the targets needed by the build were not out of date the
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recipe was not run even if other targets in the group were out of date. Now
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if any of the grouped targets are needed by the build, then if any of the
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grouped targets are out of date the recipe is run and all targets in the
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group are considered updated.
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* WARNING: Backward-incompatibility!
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Previously if --no-print-directory was seen anywhere in the environment or
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@ -10623,6 +10623,15 @@ always treated as grouped targets (@pxref{Multiple Targets, , Multiple Targets
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in a Rule}) regardless of whether they use the @code{:} or @code{&:}
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separator.
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There is one exception: if a pattern target is out of date or does
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not exist and the makefile does not need to build it, then it will not cause
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the other targets to be considered out of date. Note that this historical
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exception will be removed in future versions of GNU @code{make} and should not
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be relied on. If this situation is detected @code{make} will generate a
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warning @emph{pattern recipe did not update peer target}; however, @code{make}
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cannot detect all such situations. Please be sure that your recipe updates
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@emph{all} the target patterns when it runs.
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@node Pattern Examples, Automatic Variables, Pattern Intro, Pattern Rules
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@subsection Pattern Rule Examples
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63
src/remake.c
63
src/remake.c
@ -78,6 +78,24 @@ static FILE_TIMESTAMP name_mtime (const char *name);
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static const char *library_search (const char *lib, FILE_TIMESTAMP *mtime_ptr);
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static void
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check_also_make (const struct file *file)
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{
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/* If the target was created by an implicit rule, and it exists and was
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updated, warn about any of its also_make targets that don't exist. */
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if (file->tried_implicit && is_ordinary_mtime (file->last_mtime)
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&& file->last_mtime > file->mtime_before_update)
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{
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struct dep *ad;
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for (ad = file->also_make; ad; ad = ad->next)
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if (ad->file->last_mtime == NONEXISTENT_MTIME)
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OS (error, file->cmds ? &file->cmds->fileinfo : NILF,
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_("warning: pattern recipe did not update peer target '%s'."),
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ad->file->name);
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}
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}
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/* Remake all the goals in the 'struct dep' chain GOALS. Return update_status
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representing the totality of the status of the goals.
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@ -187,6 +205,8 @@ update_goal_chain (struct goaldep *goaldeps)
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FILE_TIMESTAMP mtime = MTIME (file);
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check_renamed (file);
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check_also_make (file);
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if (file->updated && mtime != file->mtime_before_update)
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{
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/* Updating was done. If this is a makefile and
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@ -502,6 +522,28 @@ update_file_1 (struct file *file, unsigned int depth)
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this_mtime += FILE_TIMESTAMPS_PER_S - 1 - ns;
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}
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/* If any also_make target doesn't exist, we must remake this one too.
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If they do exist choose the oldest mtime so they will rebuild. */
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for (ad = file->also_make; ad && !noexist; ad = ad->next)
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{
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struct file *adfile = ad->file;
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FILE_TIMESTAMP fmtime = file_mtime (adfile);
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noexist = fmtime == NONEXISTENT_MTIME;
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if (noexist)
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{
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check_renamed (adfile);
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DBS (DB_BASIC,
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(_("Grouped target peer '%s' of file '%s' does not exist.\n"),
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adfile->name, file->name));
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}
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else if (fmtime < this_mtime)
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this_mtime = fmtime;
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}
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must_make = noexist;
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/* If file was specified as a target with no commands, come up with some
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default commands. This may also add more also_make files. */
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@ -517,26 +559,6 @@ update_file_1 (struct file *file, unsigned int depth)
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file->cmds = default_file->cmds;
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}
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/* If any also_make target doesn't exist, we must remake this one too.
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If they do exist choose the oldest mtime so they will rebuild. */
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for (ad = file->also_make; ad && !noexist; ad = ad->next)
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{
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struct file *adfile = ad->file;
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FILE_TIMESTAMP fmtime = file_mtime (adfile);
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check_renamed (adfile);
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noexist = fmtime == NONEXISTENT_MTIME;
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if (noexist)
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DBS (DB_BASIC,
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(_("Grouped target peer '%s' of file '%s' does not exist.\n"),
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adfile->name, file->name));
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else if (fmtime < this_mtime)
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this_mtime = fmtime;
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}
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must_make = noexist;
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/* Update all non-intermediate files we depend on, if necessary, and see
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whether any of them is more recent than this file. We need to walk our
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deps, AND the deps of any also_make targets to ensure everything happens
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@ -1072,6 +1094,7 @@ check_dep (struct file *file, unsigned int depth,
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check_renamed (file);
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if (mtime == NONEXISTENT_MTIME || mtime > this_mtime)
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*must_make_ptr = 1;
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check_also_make (file);
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}
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else
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{
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@ -469,12 +469,25 @@ run_make_test(q!
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unlink('1.all', '1.q', '1.r');
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# sv 62206.
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# SV 63098: Verify that missing also_made in pattern rules gives a warning but
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# doesn't fail.
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my @dir = ('', 'lib/'); # With and without last slash.
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my @secondexpansion = ('', '.SECONDEXPANSION:');
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run_make_test(q!
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%a %b : ; touch $*a
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!,
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'gta', "touch gta\n#MAKEFILE#:2: warning: pattern recipe did not update peer target 'gtb'.\n");
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unlink(qw(gta));
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# SV 62809: Missing grouped pattern peer causes remake regardless of which
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run_make_test(q!
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all:;
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include gta
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%a %b : ; touch $*a
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!,
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'', "touch gta\n#MAKEFILE#:4: warning: pattern recipe did not update peer target 'gtb'.\n#MAKE#: 'all' is up to date.");
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unlink(qw(gta));
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if (0) {
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# SV 12078: Missing grouped pattern peer causes remake regardless of which
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# target caused the rule to run.
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touch(qw(gta)); # but not gtb
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run_make_test(q!
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@ -528,6 +541,9 @@ touch(qw(b.1st));
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run_make_test(undef, '', "cp b.1st b.2nd\n");
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unlink(qw(a.1st b.1st a.2nd b.2nd));
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}
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# sv 62206.
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# The following combinations are generated with and without second expansion.
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# 1.
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@ -548,6 +564,9 @@ unlink(qw(a.1st b.1st a.2nd b.2nd));
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# all: bye.x
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# lib/%.x: ...
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my @dir = ('', 'lib/'); # With and without last slash.
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my @secondexpansion = ('', '.SECONDEXPANSION:');
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for my $se (@secondexpansion) {
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for my $d (@dir) { # The directory of the prerequisite of 'all'.
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for my $r (@dir) { # The directory of the target in the rule definition.
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